Driving device for a centrifugal spinning machine



Aug. 17, 1937. w. H. HOFSTEDE-CRULL 2,089,933

DRIVING DEVICE FOR A CENTRIFUGAL SPINNING MACHINE Filed Aug. 9, 1935-JZMQ/ Patented Aug. 17, 1937 UNITED STATES mnvnvo DEVICE son. ACENTRIFUGAL srnmmc mcnmn Rento Wolter Hendrik Hofstede-Crull,Doetinchem, Vennootschap:

Netherlands, assignor to Naamlooze Internationale Spinpot ExploitatieMaatschappij I. S. E. M., Doetinchem, Netherlands, a corporation of theNetherlands Application August 9, 1935, Serial No. 35,460 In theNetherlands August 15, 1934 1 Claim.

The invention relates to a driving device for a centrifugal machine, inparticular a centrifugal spinning machine, and has for its object toprovide a simplified and improved construction.

It is already known to mount a spinning pot for artificial silk upon theend of a relatively long vertical spindle, passing through the hollowdriving rotor of the spinning pot and supported in the bottom wall ofsaid rotor. This spindle is made flexible either by making it thinthroughout its entire length, or for a part only of its length, e. g. byweakening this part by a helical form'atiom thereof, or by forming it ofa thicker upper portion and a thinner lower por- .while the lower end isfreely rotatable in the bottom wall of the hollow rotor.Motion-transmitting springs rotating together with the rotor may then beused for driving the spindle.

In order to eflect a simplification and improvement of these knownconstructions, according to the present invention use is made of atwo-part spindle, comprising a relatively long thicker upper portion anda relatively thin lower portion, which latter portion is at its lowerend attached in the bottom of the hollow rotor andat its-upper end inthe lower end of the longer upper portion ofthe spindle; thus, only thisthin portion has to be made of superior flexible material, which may bechosen for the purpose in question and the thickness of which may beadapted thereto.

If, on account of vibrations to which the two part spindle is subjectedin operation, in the long run breakage of the thin spindle portionoccurs, then the whole spindle need not be renewed but only the lowerportion. As only this latter portion is made of superior material, theonstruction is cheaper than those in which the whole spindle must bemade of superior material. By reason of the fact that the thin shortlower portion of the spindle is coupled to the hollow by way of example.

The figure of the accompanying drawing is a vertical section of adriving device according to the invention selected by way of example,

As shown I denotes the upper relatively long and thick portion of thevertical centrifugal spin- 5 die and 2 the lower relatively short andthin portion. The latter portion, which is mad of highgrade material, iscoupled at 3, for instance by a transverse bolt, to the upper spindleportion, and at 4, for instance also by a transverse bolt, to thebottomwall 5 of a hollow rotor 6. This hollow rotor is rotatably mounted inball bearings I in a casing 8 in which is also located the stator 9. Theopening ill in the top wall of the. casing from which the upper end ofthe spindle portion l protrudes is covered by .a protecting cap llmounted on the spindle portion I so as to prevent the ingress of acids.

It will be clear that the thin short spindle-g portion may be readilyinterchanged. As a sup'erior material for this spindle portionnickelsteel, chromium steel and in general well-known high-grade metalsand alloys may be mentioned I claim:

In a centrifugal spinning machine, the combination of a supportingstator withan anti-friction bearing carried by said stator and rotatablysupporting a rotor, said rotor having an axial 30 here extending intosaid rotor from the open end thereof, a drive shaft of relativelyinferior metal and of diameter large enough to insure against breakageof said drive shaft, said drive shaft extending into said bore to apoint ad- 35 jacent the end of said bore, and said bore having apredetermined clearance about said drive 'shaft, and a resilient stubshaft axially and fixedly secured to the inner end of said drive shaftand to the end of said rotor in said bore, said 40 stub shaft being ofrelatively smaller diameter and of metal having superior resilient andflexible characteristics, whereby the rotor is rotatably and resilientlysupported by a drive shaft of sufflcient stiffness to prevent whippingwhile the 45 resilient stub shaft effects automatic axial aligninent ofthe rotor and drive shaft by centrifugal action.

RENTO WOL'I'ER.

HENDRIX HOFS'IEDE-CRULL. 50

